diff --git a/demos/DemoParser.cpp b/demos/DemoParser.cpp
index 424dccee..6875af7c 100644
--- a/demos/DemoParser.cpp
+++ b/demos/DemoParser.cpp
@@ -1,5 +1,6 @@
 #include "ui_DemoParser.h"
 #include "parser/Parser.h"
+#include "parser/ParserListener.h"
 #include <QApplication>
 #include <QTimer>
 #include <QFileInfo>
diff --git a/demos/PlotCurve.cpp b/demos/PlotCurve.cpp
index 954a7946..f2e53d4b 100644
--- a/demos/PlotCurve.cpp
+++ b/demos/PlotCurve.cpp
@@ -17,6 +17,7 @@
 
 #include "sfizz/Curve.h"
 #include "sfizz/parser/Parser.h"
+#include "sfizz/parser/ParserListener.h"
 #include "absl/strings/numbers.h"
 #include "absl/types/span.h"
 #include <iostream>